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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51995

Title: A Study of the Sandbar Evolution by Tidal Current Effect
Authors: Yun-Chih Chiang
Sung-Shan Hsiao
Hui-Ming Fang
Hsing-Yu Wang
Contributors: 國立臺灣海洋大學:河海工程學系
Keywords: sandbar
tidal effect
quasi-three-dimensional morphological model
Date: 2013-10
Issue Date: 2019-01-10T08:14:39Z
Publisher: 海洋工程學刊 Journal of Coastal and Ocean Engineering
Abstract: Abstract: Sandbar evolution is a key feature of coastal morphodynamics and nearshore hydrodynamics. Hoefel and Elgar (2003) indicated the mechanics of wave-induced sediment transport and sandbar migration: large waves breaking on the sandbars caused offshore mean currents, which maximum near the sandbar crest, will lead sandbars moved offshore; small waves pitching forward on the sandbars made the onshore acceleration skewness of wave orbital velocities, which maximum near the sandbar crest, will lead the sandbar moved onshore. If the sea-level fluctuated significantly, the dynamic behavior of sandbar formation and migration could be different in high and low water-level. In this study, the characteristic sets of morphodynamics in different water-levels were discussed for a meso- to macro-tidal intermediate beach. A morphological quasi-three-dimensional (Q3D) model has been employed.The morphodynamics response of sandbar formation was compared with the results from mean water-level in all tidal period and high/low tide in half tidal period by Q3D models. It is shown that the water-level fluctuations play the important role for meso- to macro-tidal intermediate beach. Numerical simulations of the multi-sandbar formation and migration for YanLiao coastal area were also validated with field observation data.The results put forward the key role of morphodynamics settings and the set of tidal range in governing sandbar dynamic behavior, and provide strong support for suggestions that sandbars cannot be studied in fixed water-level for meso- to macro-tidal intermediate beach.
Relation: 13(3) pp.275-294
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51995
Appears in Collections:[河海工程學系] 期刊論文

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